Piston-packing.



PATENT oEEIoE.

WILLIAM B. NORTON, OF DETROIT, MICHIGAN.

PlSTON-PACKING.

Specification of Letters Patent.

Patented Aug. 1, 1905.

Application filed November 21, 1904.. Serial No. 233,615.

To all whom it may concern: j

Be it known that I, WILLIAM B. NORTON, a

citizen of the United States, residing at Deothers skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

, This invention relates to piston-packing. It has for its object an improved lmetallic packing intended to be used to produce a tight joint between the piston-head and the walls of the cylinder. The packing consists of elastic rings, which engage so closely against the walls of the cylinder and against the parts which confine them to the piston-head and so closelyy with one another that neither steam, air, nor the compressed gases of explosive-engines are able to escape from the piston-chamber to the outside thereof or from one chamber of the piston to another chamber of the piston.

In the drawings, Figure l is a sectional view showing the cylinder-walls, the pistonhead, and the packing-rings. Fig. 2 is a plan View showing the head of the piston and showing the cylinder in section. In this View the two lower packing-rings are shown. Fig. 8 is a similar section showing the two packingrings which are near the end of the pistonrod and indicating by dotted lines the two rings which are shown vin Fig. 2.

l indicates the cylinder.

2 indicates the piston-stem.

.3 indicates the piston-head, which is provided with a seat 4 for packing-rings and with a second seat 5 of smaller internal diameter for a junk-ring. On the seat 4 are placed two packing-rings of the kind known as eccentric packing-rings-that is, they are flat rings having the inner boundary-line, so that each ring has a broader fiat face at one part, and from this broad part the breadth across the face of the ring gradually diminishes until at a point opposite the broad part the ring has the narrowest part of its face. The ring has a uniform thickness betweenl its faces. The ring is cut through or split at the narrow part 6. The diameter of the inner boundary f 4second ring, and one ring may be placed Within the other with the Wide pm of the one engaging -in close'proXimity. to the narrow part of the second. When thus assembled, they together form a compound ring whose inner and outer peripheries are substantially concentric, but which as a whole is capable of slight expansion and contraction, because each ring is split. A pair ofthese rings 7 and 8 are placed on the seat 4, and a second pair of eX- actly similar rings are placed above the first pair, with the thin part of each upper ring lying above the wide part of the corresponding lower ring. Thus all the joints of the rings are arranged to cross each other, and in no place is one joint made as a continuation of the joint of another part. Above the upper pair of rings nearest the end of the piston-rod is placed an ordinary junk-ring 9, which is held to the piston-head by screws 10, inserted in proper screw-holes. The threaded end of the screw engages in a tapped hole in the seat for the junk -ring. The stem part may pass through a perforation in the junk-ring or (as I prefer) may engage in holes that are half in the junk-ring and half in the piston.

All the iiat surfaces of `both seats, rings, and junk-ring are preferably ground surfaces.

The rings are made of some resilient material, generally of cast-iron, which possesses suiicient resiliency and retains its elasticity under quite high temperature.

Between the ends of the ring which lies on the seat t and diametrically on the outside is placed a key or pin Il, which is fast in the body of the piston-head and engages between the ends of the innermost ring and engages in a shallow notch I3 1n the outermost ring.

The key prevents the rings from movingfrom the position in which they are originally placed. The upper set of packing-rings 17 and 18 are held in asimilar manner, the lower rings passing ovel1 pin for upper rings and then turned to pass over the lower pin.

What I claim is- 1. A piston-packing, having in combination apair of eccentric rings of dierent diameters and the smaller located inside the larger, a second pair of similarly-arranged ringslsuperimposed upon the h'rst with the thin part of each immediately above the thick portion of the corresponding ring of the lower pair and a junk-ring adapted to hold the assembled rings in position, substantially as described.

2. In a piston-packing, the combination of.

split eccentric rings arranged in pairs, the members of each pair havlng different diameters. and in each pair the ring of smaller diameter being arranged Within the ring of larger diameter and with its split portion directly above the wide portion of the corresponding ring of the next lower pair, means for holding the rings in position, and a junkring adapted to hold the assembled packingrings to their seat, substantially as described.

3. In a piston-packing, the combination of a plurality of pairs of eccentric rings each split at its thinnest portion, the smaller ring of each pair fitting within the larger thereof and the split portion of each ringheng placed over the wide part of the corresponding ring` in the pair immediately below, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

VVlLLlAM B. NORTON. Witnesses:

MAY E. KOTT, CHARLES F. BURTON. 

